Home Up Purpose Timber Mgmt Draft Management Plan

Friends of Boggs Mountain

PO Box 735 Cobb, 95426

 

Dedicated to enhancing the visitor's experience at Boggs Mountain Demonstration State Forest

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Timber Harvests

Timber Management

 

A.       Area and Ownership.

The recorded acreage of the Forest is 3,493 acres.  There are no private ownerships included within the Forest boundaries.  Most of the adjacent ownerships on the west side of the Forest have been developed for summer home subdivisions.  Ownerships on the north, east, and south side of the Forest are largely unmanaged cutover timberlands and brush covered lands.  The Forest has common boundaries with 8 subdivisions and some 70 private landowners.

 

B.     Type, Site, and Stocking.

                 (i)     Timber Type

The Forest contains 3,221 acres of commercial timber type land and 172 acres of nontimberland.

Three commercial timber types are recognized on the Forest: Pacific ponderosa pine, Pacific ponderosa pine/Douglas-fir, and Douglas-fir.  Since then this has been simplified to Pacific ponderosa pine and mixed conifer.  Ponderosa pine predominates on the west slope and top of the mountain with about five percent sugar pine included.  The northeast slope of the mountain supports a mixed conifer Pacific ponderosa pine/Douglas-fir stand with various densities of ponderosa pine, sugar pine, and Douglas-fir.  A very small patch of incense-cedar (Libocedrus decurrens) is located near the northeast corner of Section 12.  Several patches of brush, MacNab cypress (Cupressus macnabiana), and hardwoods are located at lower elevations along the northeast boundary of the Forest.

               (ii)     Site Class

The average site index for BMDSF is quite uniform, being Dunning Site I or better and Dunning and Reineke site 70+.  The timber site classes indicated by the 1966-67 cruise placed most of BMDSF in site I (175’) and Meyer’s Site Index 110.[1] 

Table 2 Dunning Site Class for BMDSF

DUNNING SITE CLASS

DUNNING & REINEKE SITE CLASS

PERCENT OF FOREST

IA

80-100

43

I

60-70

51

II

50

3

III

40

1

NONTIMBER

NONTIMBER

2

 

 

100

 

Another method is to use Biging and Wensel site index equations.  In that system, the site class distribution of the BMDSF is primarily in site classes 3-5, with small amounts in site classes 1 and 2. 

Table 3 Biging and Wensel Site Class for BMDSF

Bulletin 201 Site Class

Percent Of Acres

1

2.3

2

3.5

3

24.4

4

50

5

19.8

 

100

              (iii)     Stocking

Nearly all of the forest land is well-stocked with commercial conifer species.  Conditions for natural regeneration after Setzer's 1947-1950 logging were very favorable and practically all of the areas left unstocked immediately after logging have since become stocked and support excellent stands of reproduction with ponderosa pine (Pinus ponderosa) predominating.  Based on the 2001 CFI, the average basal area for the entire 3493 acres is 112 ft2/Ac.

C.      Timber Volume.

When the State acquired title to the Forest in 1949, the estimated total timber volume was 6,100,0,00 board feet on 3,433 acres.

No timber was cut on the Forest from the time of acquisition until 1967 when 3,085,000 board feet of old growth was cut.  A Forest-wide inventory was completed the same year, which estimated the total gross timber volume after the 1967 cut at 31,465,000 board feet on 3,433 acres, 6 million or more of which was old growth.  The acquisition estimate, apparently, considerably underestimated the actual merchantable volume on the Forest.  The 2001 Continuous Forest Inventory estimated the gross timber volume as 13,485 board feet per acre[1] on 3,493 acres.

D.     Growth and Yield Possibilities.

Following a 1976 cruise, the net annual board foot volume growth on the Forest was estimated at 1,101,418 board feet by projection of growth plot.  Net annual growth per acre overall was estimated to be 334 bd. Ft/acre.

Based on the 1991, 1996, and 2001 continuous forest inventory cruises, the current forest growth appears to be 333 Board Feet/acre/year[2].  While all figures are preliminary work products and are subject to change in the final version as more information becomes available, these figures are based on actual measurements and not a projection from yield tables.

E.       Accessibility - Road System.

An access road system based on the original logging road network was established shortly after the Forest was acquired.  Starting in 1965, major portions of the original road system were rebuilt to improve grade, alignment, and drainage.  Some short sections of new roads were constructed to avoid adverse grade problems.  The 22-mile forest road system consists of 12 miles of primary, all-weather roads and 10 miles of secondary seasonal roads.  No further additions to the road system are planned.  Existing roads will be improved or decommissioned as funds and opportunities arise.

All roads on BMDSF that are no longer required for management and recreational purposes will be considered for abandonment.  Roads to be abandoned will include user-generated roads, temporary roads and roads to be permanently closed.  User-generated roads are those that vehicles have made by not following a recognized BMDSF road and creating tracks for others to follow.  Temporary roads can be defined as roads that are used for one or two years for timber sale activity and then abandoned.  They may be reopened and reused in the next timber sale entry.  Permanently closed roads are those roads that have no planned future use.

F.       Ground Cover.

Within the forested areas, ground cover varies from pine needle litter to patches of shrubs typical of central and northern inland California foothill areas.  Under the denser stands of timber, the ground is park-like and open with no undergrowth and grades into sparse grass and dense brush in the more open stands.

Areas that were unstocked following logging have since become a thick cover of predominantly ponderosa pine reproduction and/or brush.

The brush patches are composed principally of giant manzanita (Arctostaphylos manzanita), and white leaf manzanita (Arctostaphylos viscida).  White leaf manzanita predominates, and occurs, for the most part, in pure stands.  Some Ceanothus spp. is also present.  Ponderosa pine reproduction has forced its way up through the brush canopy in many of the brush patches.



[1] This estimate is  based on the 12 DBH class and larger since this gives the most conservative estimate for harvesting purposes.  Any numerical estimate is a work in progress and subject to change as more info becomes available

[2] IBID

 

 © 2004 Friends of Boggs Mountain